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Sexing Betta Mandor
July 7, 2009
9:22 am
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Enda
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Dear All,

I've had a couple of Betta mandor for some months now, that were both sexed as male. I'd like some help in learning how to sex them, so that I might possible find a female in the future.

This is a recent photo of my dominant male.

[Image Can Not Be Found]

This is the subdominant fish, in an early photo, also sexed as male. This is stress colouration

[Image Can Not Be Found]

What is the best way to sex this fish?
The profile on the KB suggests using the colour of the opecular bands and the length of unpaired fins.

Cheers,
Enda

Attached files

[Image Can Not Be Found] [Image Can Not Be Found]

July 7, 2009
9:48 am
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oaken
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What I noticed was that females were always a dull brown and didn't have the more pointed fins that the males have. I'd say the fish in the second picture is also a male, as well.

July 7, 2009
10:32 am
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Matt
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From the description paper:

"Adpressed posterior rays of dorsal fin of male reaching caudal-fin base, adpressed posterior rays of anal fin reaching end of anal fin. Adpressed posterior rays of dorsal fin of female not reaching caudal-fin base, adpressed posterior rays of anal fin reaching half of caudal fin."

and

"Colour dimorphism present, males sometimes totally jet black and female brownish."

...which is basically a long-winded version of what Gustav said. /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" /> It also says the opercular bars can "range from yellow to red" but doesn't mentiojn any sexual dimorphism in that respect. May have misread it when doing the profile so will make a quick adjustment now. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Cake or death?
July 7, 2009
12:47 pm
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retro_gk
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Look for the ovipositor on mature females. Shows up as a white dot just in front of the anal fin.

July 8, 2009
2:39 am
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Enda
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Hmm... thanks all for the info guys.

Retro, I was wondering if the presence of the white dot is always a reliable sign for sexing. My experience with Betta imbellis is that sometimes males have a white dot too.

I think fin length, as from the description paper, might be the simplest way to sex. The problem is, many fish come in with damaged fins. It seems that colour is a good way to tell in conditioned specimens. The problem with this being that most newly important fish won't show good colours.

Matt, do you have a pdf of the description paper, Tan, H.H. and P.K.L. Ng. - Ichthyol. Explor. Freshwat. 17(2):97-114. 2006 "Six new species of fighting fish (Teleostei: Osphronemidae: Betta) from Borneo."? Do you think you could send it to me please? /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> It'd like to read the mandor description.

Thanks!

July 8, 2009
11:56 am
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retro_gk
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Some males show a white spot (especially if they're well fed), but it is rarely as prominent as on females.

July 12, 2009
10:25 am
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Enda
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Thanks retro, I'll bear that in mind when sexing fish next time.

Anyway, here's another photo of my male mandor`flaring. I love the blue-green sheen on the anal and caudal fins. Not a very good photo, but it captures the actual colour well.

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found]

September 20, 2009
10:26 am
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Enda
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Hi everyone, I have another fish, acquired in a separate batch that also was sold as Betta mandor. However, it seems considerably different from my male, shown in the pix above. It does not have the same blue-green colouration; instead its colour is mainly reddish-brown. Its unpaired fins are nowhere as long; I've had it for some three months now and its fins don't show any evidence of growing longer. Its caudal fin also does not have the same clean spade shape, although this may be due to previous injury. However, it is more aggressive than my current male (in fact its the dominant one now), so I assume it is a male too (?). Can anyone help with an ID? Is this mandor and what sex?

Any help is much appreciated!

[Image Can Not Be Found]

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found] [Image Can Not Be Found]

September 21, 2009
5:16 am
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retro_gk
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The new purchase looks like B. strohi to me. Upper part of the tail produced into a point as opposed to the middle.

As to sex, possibly a male.

September 22, 2009
3:50 am
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Enda
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QUOTE (retro_gk @ Sep 21 2009, 12:59 PM) < {POST_SNAPBACK}>
The new purchase looks like B. strohi to me. Upper part of the tail produced into a point as opposed to the middle.

As to sex, possibly a male.

Thanks Retro, I suspected that it might be Betta strohi . Any other input, anyone else?

Anyway, I'm going to sell these two fish soon, cos I'm moving house and will be overseas for a month. I'm taking the opportunity to revamp my setups.

September 23, 2009
4:59 pm
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Matt
Málaga, Spain
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Male strohi for me too Enda. /thumbs_up.gif" style="vertical-align:middle" emoid=":thumbsup:" border="0" alt="thumbs_up.gif" />

Cake or death?
September 24, 2009
2:08 am
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Enda
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Okay, thanks Matt /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

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